Odpowiedzi

2010-04-13T14:58:22+02:00
X+2x = x+9
3x=x+9
2x=9
x=4,5

y+2y-5 = 11-y
3y-5=11-y
4y=16
y=4
2010-04-13T14:59:23+02:00
X+2x=x+9
3x-x=9
2x=9
x=4,5

y+2y-5=11-y
3y+y=11+5
4y=16
y=4
2010-04-13T15:01:44+02:00
X+2x-x=9
2x=9/:2
x=4,5


y+2y-5=11-y
y+2y+y=5+11
4y+16/:4
y=4